JP3254387B2 - Locking device, gauge plate used for this locking device, and method of changing unlocking number of this locking device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a locking device which can be unlocked by pushing a predetermined push button provided on a holder case, a gauge plate used for the locking device, and The present invention relates to a method for changing the unlocking number of the locking device.

[0002]

2. Description of the Related Art Conventionally, in the above-described locking device, a plurality of push buttons are provided on the front side of a holder case so as to be able to move back and forth. The lock mechanism provided in the holder case is released by moving only some preset tumblers by the push buttons provided in correspondence with each push button (actual fairness 2-40206). Japanese Patent Publication No. Hei. 3-54281 and Japanese Patent Publication No. 3-78467).

In this case, the lock mechanism is capable of moving a frame-shaped slider having a convex portion on the inner peripheral side engaging with one side in the width direction of each tumbler in a direction perpendicular to the tumbler moving direction in the holder case. And the rotation of the operation knob is linked to the movement of the slider. Therefore, when only the tumbler for unlocking is pushed, the engagement between each tumbler and the convex portion is released, and the slider becomes movable and the lock is released. One side of the direction is engaged with the convex portion, whereby the movement of the slider is restricted, and the operation knob cannot be rotated, so that the lock state is established.

For this reason, on one side in the width direction of each tumbler, a lock portion and a release groove for engaging and disengaging from the protrusion of the slider are formed in an uneven shape. On the other hand, the holder case is provided with a positioning spring which engages with the other side in the width direction of each tumbler and locks the tumbler at the pushing operation position. On the side, a locking portion for engaging with this spring is formed.

[0005]

In the above-mentioned conventional locking device, the combination of the push button symbols corresponding to the tumbler for unlocking is the unlocking number. Therefore, when the user wants to change this unlock number, remove the back cover of the holder case,
The arrangement contents may be changed by replacing the unlocking tumbler with another tumbler or changing the mutual position.

When the unlocking number is changed as described above, each tumbler has a locking portion, a release groove, and a locking portion having different shapes on both sides in the width direction as described above. If it is incorrect, the slider of the lock mechanism and the positioning spring will not function properly. However, since each tumbler is a small piece of plate, and since the user generally does not generally understand the operating principle of the locking mechanism of the locking device, when changing the unlocking number, each tumbler is moved in the width direction. In some cases, the mounting direction was reversed and left and right were reversed.

[0007] In view of such circumstances, the present invention enables the direction of mounting each tumbler to a holder case to be uniquely regulated in a predetermined direction, thereby preventing a failure when the unlock number is changed. It is an object of the present invention to provide a locking device that can be prevented, a gauge plate used for the locking device, and a method for changing the unlocking number of the locking device.

[0008]

In order to achieve the above object,
The present invention has taken the following technical measures. That is, in the locking device according to the present invention, when the tumbler is to be inserted into the case from the back side of the holder case, the direction of each tumbler with respect to the holder case is a specific direction determined for each row of the tumbler arrangement. Is provided with an insertion direction restricting means for permitting the insertion only when.

That is, the holder case is provided with a hole-shaped insertion portion for moving the tumbler to the front and back sides of the case, but the insertion portion and the cross-sectional shape of the tumbler are not in a specific direction. It has a relationship that does not fit. For this reason, mounting the tumbler in the holder case in the wrong direction never occurs. Needless to say, there are a plurality of rows of such insertion portions in the holder case according to the arrangement of the push buttons and the tumblers, and a plurality of such insertion portions are provided for each row.

The above-mentioned insertion direction restricting means is constituted by providing a groove parallel to the insertion direction on the tumbler, and providing a projection on the holder case side which can be engaged with the groove. What should I do? The projection provided on the holder case side may be the opening edge of the insertion portion for the tumbler, may be a part inside the hole, or may be provided over the entire length inside the hole. In addition, it is also possible to provide a projection on the tumbler and provide a groove on the holder case side. Furthermore,
As an example other than the one due to the engagement between the projection and the groove, the cross-sectional shape of the tumbler may be an asymmetric corrugated shape or a hook shape, and the insertion portion provided on the holder case side may have a hole shape corresponding to this. Conceivable.

Further, in the present invention, a predetermined number and a predetermined number of tumbler insertion ports are formed on the back side of the holder case, and only the insertion of the tumbler in a specific direction is allowed. A method is adopted in which the opening direction regulating means on the holder case side is formed by abutting the gauge plate having an opening shape only when necessary. If this method is adopted, no processing or the like is required for the holder case, which leads to advantages such as an increase in manufacturing cost can be prevented.

When this gauge plate is used, it is preferable to form a positioning recess on the back surface of the holder case so that each insertion port can easily match the insertion portion for the tumbler on the holder case side. Although it is preferable, this positioning recess can also be used as a back cover fitting recess originally provided in the holder case. In this way, there is still no need to process the holder case at all.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 5, a door latch 1 can be moved back and forth from a side end surface of a door 2 and can be freely engaged with and disengaged from a latch receiving bracket provided on a door frame (not shown). The operation mechanism 3 on the indoor side includes a vertically long rectangular tray-shaped decorative cover 4 attached to the indoor side of the door 2, and an indoor knob 5 rotatably provided below the decorative cover 4.

The door locking device 6 provided on the outdoor side has a holder case 7 attached to the door 2 on the outdoor side and having a vertically long box shape with an open back side, and an outdoor unit rotatably mounted on the case 7. A knob 8 is provided, and the decorative lid 4 and the holder case 7 are fixed at corresponding positions inside and outside the door 2 by the same mounting bolts 9 that penetrate the door 2 from the indoor side.

The indoor knob 5 and the outdoor knob 8 coaxially correspond to each other inside and outside the room, and are connected to the latch drive shaft 10 in an interlocked manner. The latch drive shaft 10 has a flat and long plate shape, and the indoor end is fitted into the boss 11 of the indoor knob 5, and the outdoor end is inserted into the outdoor knob 8 in the holder case 7.
When the latch drive shaft 10 is turned in either direction through the knobs 5 and 8, the door latch 1 moves the door latch 1 to the door 2.
It can be pulled inside.

The latch drive shaft 10 includes a drive pinion gear 12
When the lock mechanism 16 to be described later is in a locked state, the rotation of the gear 12 is restricted and the rotation of the outdoor knob 8 in the unlocking direction becomes impossible. When the lock mechanism 16 is unlocked, the rotation of the gear 12 is allowed, and the outdoor knob 8 can be rotated in the unlocking direction.

The locking device 6 includes a plurality of rows (two in the illustrated example).
In each row, a plurality of push buttons 14 are provided on the front side of the holder case 7 so as to be freely retractable, and the tumbler 15 that moves to the back side of the holder case 7 when the push buttons 14 are pressed is moved inside the case 7. Some tumblers 15 for unlocking are provided corresponding to the respective push buttons 14 and set in advance.
The lock mechanism 16 in the holder case 7 is released by moving only A by the push button 14.

As shown in FIGS. 3 to 5, the lock mechanism 16 has a guide groove 18 of the clear operating body 17 which is long in the vertical direction (the longitudinal direction of the holder case 7) at the center in the width direction. A substrate 20 having a plurality of tumbler insertion holes 19 arranged on both sides of the substrate 20, a slider 21 slidably mounted on the outside of the substrate 20 slidably, and a tumbler support 22 superposed on the slider 21 on the outside of the slider 21; Back cover 2 for detachably covering opening 7A formed on the back side of holder case 7
3 is provided.

Each tumbler 1 is inserted into the insertion hole 19 of the substrate 20.
The tumblers 15 are inserted in the case 7 so as to be movable in the front and back directions (indoor and outside directions), and the tumblers 15 are also inserted into insertion holes 22A provided on the tumbler support base 22 side. The slider 21 is formed of a plate-like frame having a size enough to surround all the tumbler insertion holes 19, and is provided in the holder case 7 so as to be movable in its longitudinal direction (vertical direction in FIG. 3). A pair of left and right compression springs 24 interposed between the upper end and the upper plate of the holder case 7 are constantly urged downward. A concave portion 25 and a convex portion 26 for engaging and disengaging one side in the width direction of each tumbler 15 are formed continuously in the sliding direction on both left and right inner peripheral edges of the slider 21.

The slider 21 includes a coil spring 2
7, the slider 21 is moved in the indoor direction against the spring 23 even if the tumbler 15 contacts the slider 21 when the tumbler 15 is pushed. However, this makes it difficult to detect the unlocking number based on a change in the pressing feeling of the push button 14 due to the contact.

In the guide groove 18 of the substrate 20, the clear operating body 1 is provided.
The clear operating body 17 is provided with a bifurcated positioning spring for holding the tumbler 15 pushed by the push button 14 at the pushing operation position as shown in FIG. 29 are provided at predetermined intervals.
The clear operating body 17 is disposed between the tumblers 15 arranged in two rows in the holder case 7, and is moved by the descending spring 30 interposed between the upper end of the operating body 17 and the upper plate of the holder case 7. Independently of this, it is constantly biased downward.

As shown in FIGS. 3 and 4, a sector gear 32 is provided above the drive pinion gear 12 so as to mesh with the gear 12 and rotate around a support shaft 31 in the indoor / outdoor direction. A release pin 33 fixed to 32 is in contact with the lower end of the slider 21. Therefore, when the upward movement of the slider 21 is restricted because the lock mechanism 16 is in the locked state, the release pin 33 cannot rotate both the gears 12 and 32, and therefore the outdoor knob 8 cannot rotate.

As shown in FIGS. 5 and 6, each tumbler 1
5 is provided on one side in the width direction with the uneven portions 25 and 26 of the slider 21.
A lock portion 34 and a release groove 35 which are engaged and disengaged from each other are formed in an uneven shape, and on the other side in the width direction of each tumbler 15,
A locking portion 36 is formed to be hooked on the tip hooking portion 29A of the positioning spring 29. Each tumbler 15 is loaded into each tumbler insertion hole 19 such that the side on which the locking portion 36 is formed faces the center of the case 7.

A spring accommodating portion 37 is formed at a position corresponding to each tumbler 15 of the back cover 23, and a return spring for urging the tumbler 15 toward the front side of the holder case 7 (upper side in FIG. 5) is provided in the accommodating portion 37. 38 are interposed. Accordingly, when each tumbler 15 is pushed by the push button 14, its locking portion 36 is hooked on the tip hooking portion 29A of the positioning spring 29, and its pushing operation position is maintained (FIG. 5). The right tumbler 15A), when the clear operating body 17 is moved upward by a clear tumbler 41 described later, the engagement with the positioning spring 29 is released, and the original is pushed out to the surface side of the holder case 7 by the return spring 38. It returns to the position (the tumbler 15B on the left side in FIG. 5).

In each tumbler 15, an unlocking tumbler 15A (right side in FIG. 5) has a release groove 35 provided on the case surface side (upper side in FIG. 5) than the lock portion 34. The tumblers 15B for unlocking other than the above (the left side in FIG. 5) are arranged in the reverse order, and the lock portion 34 is provided on the case surface side of the release groove 35. That is,
When the unlocking tumbler 15A is in the pushing operation position, the release groove 35 is located within the frame of the slider 21, and the protrusion 26 of the slider 21 does not contact the tumbler 15A. However, when the slider 21 is returned to the original position, the lock portion 34 enters the concave portion 25 of the slider 21 and engages with the convex portion 26 of the slider 21, thereby restricting the upward movement of the slider 21.

On the other hand, when the tumbler 15B for unlocking is in the pushing operation position, the lock portion 34 is
Of the slider 21
And the upward movement of the slider 21 of the slider 21 is restricted. When the slider 21 is at the original position, the release groove 35 is located in the frame of the slider 21, and the protrusion 26 of the slider 21 No contact with the tumbler 15B.

The push button 14 is formed in a cylindrical shape with a bottom, and is inserted from the surface of the holder case 7 to the outside of the room so as to be able to retreat. The return spring 3 is provided inside the push button 14.
9 are filled. The case inner end of the return spring 39 is in contact with a protruding piece 40 (see FIG. 5) protruding from the outside of the tumbler support base 22, and after the push button 14 is pressed to set the tumbler 15 to the push operation position. Is the push button 14
Only return to the original position by the return spring 39.

In the illustrated holder case 7 (see FIG. 2),
Arabic numerals 0-9 corresponding to the respective push buttons 14 and English characters of X, Y, Z and C are engraved on the front side thereof. Among them, 0 to 9 and X, Y, Z push buttons 14
Corresponds to a tumbler 15 for unlocking or unlocking,
The clear tumbler 41 is made to correspond to the push button 14.

The clear tumbler 41 moves the clear operating body 17 upward to release the tumbler 1 for unlocking or unlocking.
5 is returned to the original position, and has a cam piece 42 formed by notching one end in the width direction as shown in FIG.
An inclined cam surface 43 with which the cam piece 42 is engaged is formed at the lower end of the clear operating body 17. Therefore, when the clear tumbler 41 is pressed down via the push button 14 of C, the clear operating body 17 moves upward against the descending spring 30 by the engagement of the cam piece 42 and the inclined cam surface 43. At this time, the positioning spring 29 also moves upward to release the engagement with each tumbler 15, and each tumbler 15 at the pushing operation position returns to the original position by the return spring 38.

A slide plate 45 urged upward by an ascending spring 44 is provided below the sector gear 32, and the release pin 33 of the sector gear 32 is in contact with the upper end of the slide plate 45. The outdoor knob 8 after the rotation operation is returned to the original state by the upward movement of the slide plate 45. As shown in FIGS. 6 and 7, the tumbler 15A for unlocking and the tumbler 15B for non-unlocking have tumblers 15A, 1
Coloring section 46 for making it possible to distinguish 5B at a glance
Is provided. In the illustrated example, the coloring portion 46 is provided on the back side end of the case of each
A narrow protrusion 47 for facilitating engagement with the tumbler 15 is provided. The tip of the narrow protrusion 47 has a red paint for the tumbler 15A for unlocking and a blue paint for the tumbler 15B for unlocking. Was painted.

On the other hand, as shown in FIGS.
3 is made of a metal plate such as a steel plate, and each tumbler 1
A confirmation window 48 is provided at a position corresponding to 5. The confirmation window 48 is formed by penetrating the bottom of the spring housing portion 37 of the back cover 23 in the front and back direction with a diameter substantially equal to the width of the narrow protrusion 47 of each tumbler 15.

With such a structure, the tumbler 15
When inserting the back cover 23 into the holder case 7, attention can be given so as not to make a mistake in the front-rear direction, and even when the back cover 23 is attached, it can be easily confirmed from outside the locking device 6. You can judge it. Each of the confirmation windows 48 is provided with a colored portion 46 from the outer surface of the back cover 23.
It is preferable to form a tapered hole 49 whose diameter is increased from the inner surface of the back cover 23 to the outer surface so that it can be easily seen.

On the back surface of the holder case 7, a fitting having a space substantially equal to the plane size and the thickness of the back cover 23 is provided so that the state where the back cover 23 is attached is flush. A mating recess 51 is formed. The locking device 6 is provided with a gauge plate 52 shown in FIG. The gauge plate 52 is made of a thin metal or resin plate material, and has the same plane size as the back cover 23 of the holder case 7 described above. Therefore, this gauge plate 52
Can be just fitted into the fitting recess 51 formed by removing the back cover 23 from the holder case 7. For this reason, the back cover 2 in the holder case 7
The fitting recess 51 for 3 can be used as a positioning recess for the gauge plate 52.

The gauge plate 52 is formed with a plurality of rows and a plurality of insertion holes 53 for each row corresponding to the overall arrangement of the tumbler 15 with respect to the holder case 7. Next to each insertion port 53, Arabic numerals 0 to 9 engraved on the surface of the holder case 7 and X,
The same numerals and letters are added to correspond to the letters Y, Z and C. In addition, this gauge plate 52
The holder case 7 is brought into contact with the holder case 7 in a state where the holder case 7 is turned upside down, and the holder case 7 is directly viewed from the front (that is, the holder case 7 remains upside down).
The left and right arrangement of the appended numbers and English characters is opposite to that of the holder case 7.

Each of the insertion ports 53 is connected to the tumbler 15 unless the tumbler 15 is oriented in a specific direction.
Has an opening shape that cannot be inserted. That is, in each tumbler 15, a groove 55 parallel to the insertion direction with respect to the holder case 7 is formed in one of the front and back surfaces so as to pass through the center in the width direction, as shown in FIGS. On the other hand, each insertion port 53 of the gauge plate 52 is provided with a projection 56 that can be engaged with the groove 55.

Accordingly, by disposing the gauge plate 52 on the back side of the holder case 7, a specific direction of the tumbler 15 (with respect to the protrusion 56 of the insertion port 53) is provided between the tumbler 15 and the holder case 7. Insertion direction restricting means 5 that allows only insertion in the direction in which groove 55 is engaged).
0 will be configured. In all the tumblers 15, the surface on which the groove 55 is provided is the lock portion 34, the release groove 3
5. The predetermined relationship is established in relation to the left and right arrangement of the locking portion 36. In the illustrated example, when the lock portion 34 and the release groove 35 are directed leftward and the locking portion 36 is directed rightward when viewed from the front (when the state shown in FIG. 6A), the front surface is obtained. A groove 55 is provided on the surface.

Accordingly, each tumbler 15 is transferred to the holder case 7.
When mounted on the tumbler 15, the tumblers 15 arranged on the left side and the tumbler 15 arranged on the right side
In the left column, the groove 55 faces downward, and in the right column, the groove 55 faces upward. Therefore, as a matter of course, as shown in FIG. 9, the projections 56 provided at the respective insertion ports 53 of the gauge plate 52 are also positioned above the opening edge in the insertion ports 53 arranged on the left side, and Are located below the opening edge.

It should be noted that only the insertion port 53A corresponding to the clear tumbler 41 has a circular opening in view of the fact that the insertion direction of the clear tumbler 41 is not planned to be changed. For this reason, each tumbler 15 must be oriented in a specific direction determined in the holder case 7,
Since it cannot be fitted to the gauge plate 52 and the holder case 7, it does not happen that the tumbler 15 is attached to the holder case 7 in the wrong direction.

In the locking device 6 having the above-described structure, the unlocking buttons 14 (eg, 1, 2, 3, X, Y) of the unlocking numbers arbitrarily set from 0 to 9 and X, Y, Z are assigned to The tumbler 15A for the lock corresponds to the other push button 14
Each tumbler 15 is loaded in the insertion hole 19 so that (4-0, Z) corresponds to the tumbler 15B for unlocking.
Thus, when only the unlock number push button 14 is pressed to set all unlocking tumblers 15A to the push operation position,
In all the tumblers 15A and 15B, the engagement between the lock portion 34 and the convex portion 26 is released, whereby the slider 21 is disengaged.
Can move upward, and the lock of the outdoor knob 5 is released.

On the other hand, the tumbler 15A for unlocking is not pushed due to the wrong unlocking number, or the tumbler 15
When B is pushed, any of the tumblers 15A, 15B
Lock portion 34 engages with the convex portion 26, whereby the movement of the slider 21 is restricted, and the outdoor knob 8 cannot rotate, so that the lock state is established. Also, if the user himself / herself mistakes the unlock number, pressing the C (clear) push button 14 causes the clear tumbler 41 to actuate the clear operating body 17 so that all the other tumblers 15A and 15B are released. Since it returns to the non-pushed position, the correct unlocking number may be pressed again thereafter.

If the user wants to reset the unlock number, the user removes the back cover 23 from the holder case 7 and replaces the unlocking tumbler 15A with another tumbler 15A.
It is sufficient to change the arrangement contents by exchanging B or changing the mutual positions. For example, unlock numbers 1, 2, 3, X,
When Y is set to 1, 2, 3, X, or Z, the tumbler 15A for unlocking Y and the tumbler 15B for unlocking Z may be exchanged.

In this case, since the coloring portion 46 is provided at the rear end of the case of the tumbler 15,
Can be prevented from being mistaken in the front-rear direction when the tumbler 15 is inserted, and by using the gauge plate 52, the orientation of the tumbler 15 can be completely prevented from being mistaken. Further, since the back cover 23 is provided with the confirmation window 48, even after the back cover 23 is attached to the holder case 7, the presence or absence of the coloring portion 46 can be confirmed from the confirmation window 48 or the coloring portion 46 can be confirmed. It is extremely easy to confirm the arrangement of the tumbler 15A for unlocking and the tumbler 15B for unlocking by determining the color.

[0043]

In the above embodiment, the clear operating body 1
7 is provided between the tumbler 15 in the left-hand row and the tumbler 15 in the right-hand row, so that the engagement positional relationship between the groove 55 and the projection 56 is different between the left-hand row and the right-hand row. However, if a plurality of clear operating members 17 are provided, the engagement positional relationship between the groove 55 and the projection 56 can be aligned in the same direction in the left and right rows.

In the above embodiment, instead of the outdoor knob 8, a key box for rotating the drive gear 12 by rotating a key inserted from outside may be provided in the holder case 7. In this case, the lock cannot be released unless the key is further inserted and turned after pressing the push button 14 of the predetermined unlock number, and a double lock mechanism by the push button 14 and the key operation is configured. .

[0046]

As described above, according to the present invention,
When each tumbler is mounted on the holder case, the insertion direction in the width direction can be uniquely regulated in a predetermined direction, so that a failure at the time of changing the unlock number can be prevented beforehand. In addition, since the gauge plate is attached separately from the holder case, there is no need to change the design of the holder case at all, and there is no danger of increasing the production cost. There is an advantage that the present invention can be extremely easily applied to a locking device.

[Brief description of the drawings]

FIG. 1 is a side view showing a mounting state of a locking device.

FIG. 2 is an external view of the apparatus as viewed from the indoor side.

FIG. 3 is a longitudinal sectional view showing an internal structure of the device.

FIG. 4 is a front view showing the internal structure of the apparatus as viewed from the indoor side.

FIG. 5 is a sectional view taken along line AA of FIG. 4;

FIG. 6 (a) is a front view of a tumbler for unlocking,
(B) is a front view of the tumbler for unlocking.

FIG. 7 (a) is a bottom view of a tumbler for unlocking,
(B) is a bottom view of the tumbler for unlocking.

FIG. 8 is a perspective view showing a relationship between a clear operating body and a tumbler.

FIG. 9 is a front view showing a gauge plate.

[Explanation of symbols]

 Reference Signs List 6 Locking device 7 Holder case 14 Push button 15 Tumbler 15A Tumbler for unlocking 15B Tumbler for unlocking 16 Lock mechanism 23 Back cover 51 Fitting concave part 50 Insertion direction regulating means 52 Gauge plate 53 Insert port 55 Groove 56 Protrusion

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E05B 37/16 E05B 37/18

Claims (5)

(57) [Claims] A plurality of rows of push buttons (14) are provided on the front side of the holder case (7) so as to be able to move back and forth, and when the push buttons (14) are pressed, the holder case (7) is operated. Tumbler (15) that moves to the back side
Are provided in the case (7) corresponding to each push button (14), and several tumblers (15A) set in advance are provided.
In a locking device which can be unlocked by moving only the push button (14) via the push button (14), when the tumbler (15) is inserted into the holder case (7) from the back side of the case, the arrangement is determined for each row. The tumbler (15) is provided with an insertion direction restricting means (50) that allows only a specific direction of insertion of the tumbler (15), and has an insertion port (53) corresponding to the arrangement of the tumbler (15).
And the insertion port (53) is in a specific direction of the tumbler (15).
Gauge that has an opening shape that allows only insertion
The rate (52) can be adjusted as required by the holder case (7).
By contacting the back side, the holder case (7) side
A locking direction regulating means (50) . 2. The insertion direction regulating means (50) includes a groove (55) provided in the tumbler (15) and parallel to the insertion direction.
2. The locking device according to claim 1, wherein the locking device comprises a projection (56) provided on the gauge plate (7) so as to be engageable with the groove (55). 3. The locking device according to claim 2 , wherein a positioning recess is formed on the back side of the holder case so that the gauge plate can be fitted therein. 4. A positioning tumbler (15)
4. The locking device according to claim 3 , wherein the locking device is also used as a fitting concave portion (51) for a back cover (23) for preventing escape of the lock. 5. A plurality of push buttons (14) for a plurality of rows are provided on the front side of the holder case (7) so as to be freely retractable, and when the push buttons (14) are pressed, the holder case (7) is operated. Tumbler (15) that moves to the back side
Are provided in the case (7) corresponding to each push button (14), and several tumblers (15A) set in advance are provided.
In the locking device which can be unlocked by moving only the push button (14), the back cover (23) is removed from the back side of the holder case (7), and an appropriate number of tumblers are removed from the case (7). (15) is extracted, and an insertion port (53) corresponding to the arrangement of the tumblers (15) and allowing only the insertion in a specific direction of each tumbler (15) determined for each row of the arrangement is formed. The gauge plate (52) thus set is brought into contact with the back side of the holder case (7), and the tumbler (15) is inserted into the holder case (7) while the arrangement contents are varied in accordance with each insertion port (53), A method for changing an unlocking number of a locking device, comprising: attaching a back cover (23) to a holder case (7) after removing a gauge plate (52).